sysfs: reinstate count parameter to sysfs_ops.store() methods.

- Fixup struct device_attribute.
- Fix the default device attributes.

drivers/base/core.c

@@ -47,14 +47,15 @@ dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
 }
 
 static ssize_t
-dev_attr_store(struct kobject * kobj, struct attribute * attr, const char * buf)
+dev_attr_store(struct kobject * kobj, struct attribute * attr, 
+	       const char * buf, size_t count)
 {
 	struct device_attribute * dev_attr = to_dev_attr(attr);
 	struct device * dev = to_dev(kobj);
 	ssize_t ret = 0;
 
 	if (dev_attr->store)
-		ret = dev_attr->store(dev,buf);
+		ret = dev_attr->store(dev,buf,count);
 	return ret;
 }
 

drivers/base/interface.c

@@ -24,7 +24,7 @@ device_read_power(struct device * dev, char * page)
 }
 
 static ssize_t
-device_write_power(struct device * dev, const char * buf)
+device_write_power(struct device * dev, const char * buf, size_t count)
 {
 	char	str_command[20];
 	char	str_level[20];
@@ -80,7 +80,7 @@ device_write_power(struct device * dev, const char * buf)
 			error = 0;
 	}
  done:
-	return error < 0 ? error : strlen(buf);
+	return error < 0 ? error : count;
 }
 
 static DEVICE_ATTR(power,S_IWUSR | S_IRUGO,

include/linux/device.h

@@ -320,7 +320,7 @@ extern void device_release_driver(struct device * dev);
 struct device_attribute {
 	struct attribute	attr;
 	ssize_t (*show)(struct device * dev, char * buf);
-	ssize_t (*store)(struct device * dev, const char * buf);
+	ssize_t (*store)(struct device * dev, const char * buf, size_t count);
 };
 
 #define DEVICE_ATTR(_name,_mode,_show,_store) \